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$545+ Cheap flights from London (LON) to Seattle (SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/23. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
May 4 — May 111
Sun 5/4
Sun 5/11
1 adult, Economy
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Find cheap flights from London to Seattle with Cheapflights

1. Tell us where you want to go

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2. Select your favorite providers

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3. Compare prices and book

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Cheapflights Tip: The best prices from London to Seattle/Tacoma Intl are usually found in January or March, booked 69 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from London to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 29, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$616
(lastminute.com)

One-way from

$545
(Kiwi.com)

Popular in

August

Cheapest in

January

Average price

$709

Good round-trip deal

$694 or less

Good one-way deal

$765 or less
Provider with most accurate pricing for London (LON)-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for London (LON)-Seattle/Tacoma Intl flights.
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From London (LON) to Seattle/Tacoma Intl
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One-way flight from London (LON) to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 16% potential increase in price ($147 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from London (LON) to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from London (LON) to Seattle/Tacoma Intl.
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Find flight deals from London to Seattle

Cheapest flights from London to Seattle
Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 29, 2025.

This Gotogate deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/203:40 pmLGW - SEA
1 stop13h 00mIcelandair
Sat 10/113:45 pmSEA - LGW
1 stop14h 55mIcelandair
Deal found 4/29$613
This lastminute.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/89:25 pmLHR - SEA
1 stop28h 25mIcelandair
Thu 5/2211:30 pmSEA - LHR
1 stop12h 50mIcelandair
Deal found 4/29$616
This Lufthansa deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/179:00 amLHR - SEA
1 stop15h 59mMultiple Airlines
Thu 9/2510:55 amSEA - LHR
1 stop13h 25mMultiple Airlines
Deal found 4/29$618
This Cheapflightsfares deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/177:40 amLHR - SEA
1 stop18h 10mBritish Airways
Thu 9/258:20 pmSEA - LHR
Nonstop9h 20mBritish Airways
Deal found 4/29$619
This lol.travel deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/57:30 pmLHR - SEA
1 stop26h 20mScandinavian Airlines
Mon 6/94:00 pmSEA - LHR
1 stop18h 30mScandinavian Airlines
Deal found 4/29$621
This Mytrip deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/87:35 amSTN - SEA
2 stops18h 15mMultiple Airlines
Thu 5/223:45 pmSEA - STN
2 stops17h 40mMultiple Airlines
Deal found 4/29$623
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/107:25 amLHR - SEA
1 stop17h 34mUnited Airlines
Mon 9/1510:55 pmSEA - LHR
1 stop24h 00mUnited Airlines
Deal found 4/29$623
This Gotogate deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/88:30 amLHR - SEA
2 stops19h 07mAir Canada
Thu 5/227:20 amSEA - LHR
1 stop18h 40mAir Canada
Deal found 4/29$635
This The Travel House deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/136:35 pmLGW - SEA
2 stops34h 56mSWISS
Sun 5/1812:45 pmSEA - LGW
2 stops45h 05mSWISS
Deal found 4/29$641
This World Air Fares deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure World Air Fares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/299:15 amLHR - SEA
2 stops19h 15mFinnair
Wed 9/1711:59 pmSEA - LHR
2 stops25h 46mFinnair
Deal found 4/29$644
This EaseMyTrip deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure EaseMyTrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/136:15 amLHR - SEA
1 stop13h 00mVirgin Atlantic
Fri 5/238:20 pmSEA - LHR
Nonstop9h 55mVirgin Atlantic
Deal found 4/29$656
This Cheapflightsfares deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/179:05 amLCY - SEA
1 stop16h 45mBritish Airways
Thu 9/257:35 pmSEA - LCY
1 stop14h 45mBritish Airways
Deal found 4/29$658

Cheapflights Fare Finder

Customize your flight search to find flights from London to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 29, 2025.
Use the filters below to find and compare flights from London to Seattle that are best for you.

Fly from

London

Fly to

Seattle

Route

Depart

Return

Price

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sat 9/20

3:40 pm-8:40 pm

1 stop13h 00m

Seattle/Tacoma Intl

Sat 10/11

3:45 pm-2:40 pm

1 stop14h 55m

$613

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 5/8

9:25 pm-5:50 pm

1 stop28h 25m

Seattle/Tacoma Intl

Thu 5/22

11:30 pm-8:20 pm

1 stop12h 50m

$616

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 6/5

7:30 pm-1:50 pm

1 stop26h 20m

Seattle/Tacoma Intl

Mon 6/9

4:00 pm-6:30 pm

1 stop18h 30m

$621

LondonSeattle

STN - SEA

STNSEA

London Stansted

Thu 5/8

7:35 am-5:50 pm

2 stops18h 15m

Seattle/Tacoma Intl

Thu 5/22

3:45 pm-5:25 pm

2 stops17h 40m

$623

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 5/8

6:50 am-6:52 pm

2 stops20h 02m

Seattle/Tacoma Intl

Thu 5/22

7:10 am-7:40 am

1 stop16h 30m

$629

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 5/8

8:30 am-7:37 pm

2 stops19h 07m

Seattle/Tacoma Intl

Thu 5/22

7:20 am-10:00 am

1 stop18h 40m

$635

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 5/13

6:20 am-4:59 pm

1 stop18h 39m

Seattle/Tacoma Intl

Tue 5/20

1:30 pm-6:50 am

Nonstop9h 20m

$639

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 5/13

8:45 am-6:33 pm

2 stops17h 48m

Seattle/Tacoma Intl

Fri 5/23

5:30 am-11:50 am

2 stops22h 20m

$640

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 5/13

6:35 pm-9:31 pm

2 stops34h 56m

Seattle/Tacoma Intl

Sun 5/18

12:45 pm-5:50 pm

2 stops45h 05m

$641

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 5/13

6:15 am-11:15 am

1 stop13h 00m

Seattle/Tacoma Intl

Fri 5/23

8:20 pm-2:15 pm

Nonstop9h 55m

$656

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 60 results
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Compare providers for flights from London to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from London to Seattle in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
CheapflightsfaresPrice Accuracy-Trust Score*2 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
Thrive TravelPrice Accuracy3 starsTrust Score*2 stars
Justfly.comPrice Accuracy3 starsTrust Score*2 stars
PricelinePrice Accuracy2 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on London-Seattle flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on London-Seattle flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from London-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London-Seattle flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

The best insider tips for London to Seattle flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your London to Seattle trip
Airports
LHR

For a smooth departure from Heathrow, ensure all liquids are in one small bag to avoid lengthy security checks.

Read more about LHRby Ramsey Qubein
SEA

Use the Link light rail for an affordable, 40-minute ride from SEA to downtown Seattle, with ample luggage space.

Read more about SEAby Brandon Schultz
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on LHR

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

Best time to book a flight from London to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from London with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London to Seattle

How far ahead should I book a flight from London to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from London to Seattle. Price data was last updated on April 25, 2025.

To ensure you get the cheapest price possible for a flight from London to Seattle, you should look to book at least 69 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from London to Seattle?

Currently, January is the cheapest month in which you can book a flight from London to Seattle (average of $238). Flying from London to Seattle in July is currently the most expensive (average of $405). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LON to SEA?

Find hourly flight availability from London to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 29, 2025.

One of the essential ways to save on airfare from London to Seattle is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 9% on airfare.

What is the cheapest day to fly from London to Seattle?

Use this chart to determine the cheapest time to fly round-trip from London to Seattle. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their London to Seattle flight should consider departing on Monday evenings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from London to Seattle

Explore weekly flight availability from London to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 29, 2025.

The most flights from LON to SEA are scheduled on a Monday (22 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (11 on average).

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated April 29, 2025.
Peruse reviews from past customers who have flown with Delta, KLM and Finnair from London to Seattle to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,936 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,936 reviews
Delta
8.0
Very good
7,936 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,333 reviews
Delta
8.0
Very good
7,936 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Finnair
7.6
Good
1,275 reviews
Delta
8.0
Very good
7,936 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
SWISS
7.5
Good
1,588 reviews
Delta
8.0
Very good
7,936 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air France
7.4
Good
1,446 reviews
Delta
8.0
Very good
7,936 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from London to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Seattle from London?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from London to Seattle. 7 airlines have flights to Seattle/Tacoma Intl from London on a regular basis. Booking flights from London to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 19 inbound flights from London per day.

  • What are the cheapest airlines flying from London to Seattle round-trip?

    Cheapflights users have booked flights from London to Seattle round-trip from $616. Other airlines that can offer you cheap pricing are Lufthansa, from $618, and United Airlines, from $620. Icelandair is currently priced 19% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from London to Seattle one-way?

    One-way options have recently been found by users for as low as $548 on Aer Lingus. Other airlines that offer cheap prices include WestJet from $556 and Icelandair from $599 one-way.

  • What are the most popular routes from London to Seattle?

    Most travelers choose London Heathrow - Seattle/Tacoma Intl, London Gatwick - Seattle/Tacoma Intl or London City - Seattle/Tacoma Intl when deciding on the best route from London to Seattle.

  • What are the most reliable airlines from London to Seattle?

    The top 3 most reliable airlines when flying from London to Seattle are Singapore Airlines (94%), Aeromexico (92%) and KLM (91%).

  • What are the cheapest flights from London to Seattle?

    While on average a flight from London to Seattle is generally $1,663, our data shows the cheapest flight currently is $661. When looking at the most popular route, (London Heathrow - Seattle/Tacoma Intl), you can expect to pay $586 for that flight.

  • Can I find deals for flights from London to Seattle that include hotel bookings?

    Yes. In addition to deals on London to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from London to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Seattle.

  • Can I find deals for business class flights from London to Seattle?

    Yes. Cheapflights offers flight deals from London to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London to Seattle?

    Currently, January is the cheapest month in which you can book a flight from London to Seattle (average of $238). Flying from London to Seattle in July is currently the most expensive (average of $405). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
SeaTac
Tukwila
Tacoma
Lakewood
Renton
Ocean Shores
Lacey
Leavenworth
Federal Way
Olympia
Shoreline
Cle Elum
Centralia
Kent
Lynnwood
Aberdeen
Shelton
Silverdale
Redmond
Issaquah

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Alternative routes for London to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from London to Seattle

Discover the top 7 airlines that operate flights from London to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$402Average$691FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$560Average$771FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$620Average$891FlexibilityNo cancel feeOn-time71%
Virgin AtlanticCheapest$635Average$978FlexibilityNo cancel feeOn-time72%
IberiaCheapest$673Average$1,001FlexibilityNo cancel feeOn-time77%
KLMCheapest$674Average$844FlexibilityNo cancel feeOn-time75%
DeltaCheapest$675Average$871FlexibilityNo cancel feeOn-timeN/A

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